"River kayaking" refers to the recreational activity of using a small, narrow boat called a kayak to navigate waterways such as rivers. Full definition
Activities include river kayaking, boat tours, tree top adventures, cultural tours, hiking tours, horseback riding, ocean kayaking and surfing. (travelcostarica.com)
Or, if you prefer, try river kayaking or ocean kayaking. (1costaricalink.com)
Some of the popular adventure activities include a 3 hours long expedition of stand up paddling, zip lining and canopy tours in the dense jungle, horseback riding on the beach during the sunset, a snorkeling tour at San Juanillo, river kayaking at river Baco, turtle tours, Yoga sessions and plenty of more! (costaricasurfing.org)